气候变化领域集成服务门户(CCPortal): Soil organic carbon becomes newer under warming at a permafrost site on the Tibetan Plateau

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DOI	10.1016/j.soilbio.2020.108074
	Soil organic carbon becomes newer under warming at a permafrost site on the Tibetan Plateau
	Chang R.; Liu S.; Chen L.; Li N.; Bing H.; Wang T.; Chen X.; Li Y.; Wang G.
发表日期	2021
ISSN	380717
卷号	152
英文摘要	Permafrost areas are experiencing fast and dramatic changes under global warming. Increased primary production and stimulated microbial activity have been widely observed in warming permafrost. However, the fate of permafrost soil organic carbon (SOC) remains elusive, and the potential mechanisms underlying warming-mediated SOC formation and old C decomposition are poorly understood. Here, using in situ six-year manipulative warming experiments with two scenarios (+2.4 °C and +4.9 °C for lower and higher scenarios, respectively, above the ambient temperature) at a permafrost site in the Tibetan Plateau, we observed that soil C sink increased in the surface 5 cm layer under the two warming scenarios. SOC exhibited a linear increase with warming duration at rates of 6.8% and 6.4% annually in the silt & clay fractions and aggregates, respectively. Warming-induced accumulations of SOC in the aggregates and silt & clay fractions were contributed mainly by plant-derived C and minorly by microbial necromass. However, the increased input of new plant-derived C was accompanied with an increasing loss of old C via enhanced respiration under warming, likely due to the mobilization and degradation of C in the aggregates and silt & clay fractions. Our study provides field-based evidence of the enhanced SOC accumulation in the Tibetan permafrost regions under warming, and improves process-based understanding of warming-induced new plant-derived C that could replace the protected old C in the aggregates and silt & clay fractions. © 2020 Elsevier Ltd
英文关键词	Amino sugars; Permafrost; Plant-derived carbon; Warming duration; Δ14C
语种	英语
scopus关键词	Soil Biology and Biochemistry
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/158339
作者单位	Key Laboratory of Mountain Environment Evolvement and Regulation; Institute of Mountain Hazards and Environment; Chinese Academy of Sciences; Chengdu; 610041; China; National Engineering Laboratory for Applied Technology of Forestry & Ecology in Southern China; Central South University of Forestry and Technology; Changsha; 410004; China; State Key Laboratory of Vegetation and Environmental Change; Institute of Botany; Chinese Academy of Sciences; Beijing; 100093; China; CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration and Biodiversity Conservation Key Laboratory of Sichuan Province; Chengdu Institute of Biology; Chinese Academy of Sciences; Chengdu; 610041; China; College of Animal Science and Veterinary Technology; Shanxi Agricultural University; Taigu; 030801; China
推荐引用方式 GB/T 7714	Chang R.,Liu S.,Chen L.,et al. Soil organic carbon becomes newer under warming at a permafrost site on the Tibetan Plateau[J],2021,152.
APA	Chang R..,Liu S..,Chen L..,Li N..,Bing H..,...&Wang G..(2021).Soil organic carbon becomes newer under warming at a permafrost site on the Tibetan Plateau.,152.
MLA	Chang R.,et al."Soil organic carbon becomes newer under warming at a permafrost site on the Tibetan Plateau".152(2021).